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            <h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>最近把《javascript高级程序设计》看完了，发现里面有很多跨浏览器的代码，总结一下，方便记录。</p>
<h2 id="跨浏览器的事件对象EventUtil-事件处理程序"><a href="#跨浏览器的事件对象EventUtil-事件处理程序" class="headerlink" title="跨浏览器的事件对象EventUtil(事件处理程序)"></a>跨浏览器的事件对象EventUtil(事件处理程序)</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> EventUtil = &#123;</span><br><span class="line">    addHandler: <span class="function"><span class="keyword">function</span>(<span class="params">element,type,handler</span>) </span>&#123; <span class="comment">//事件监听</span></span><br><span class="line">        <span class="keyword">if</span>(element.addEventListener) &#123;</span><br><span class="line">            element.addEventListener(type,handler,<span class="literal">false</span>);</span><br><span class="line">        &#125;<span class="keyword">else</span> <span class="keyword">if</span>(element.attachEvent) &#123;</span><br><span class="line">            element.attachEvent(<span class="string">"on"</span>+type,handler);</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            element[<span class="string">"on"</span> +type] = handler;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    removeHandler: <span class="function"><span class="keyword">function</span>(<span class="params">element,type,handler</span>)</span>&#123; <span class="comment">//移除事件监听</span></span><br><span class="line">        <span class="keyword">if</span>(element.removeEventListener) &#123;</span><br><span class="line">            element.removeEventListener(type,handler,<span class="literal">false</span>);</span><br><span class="line">        &#125;<span class="keyword">else</span> <span class="keyword">if</span>(element.detachEvent) &#123;</span><br><span class="line">            element.detachEvent(<span class="string">"on"</span>+type,handler);</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            element[<span class="string">"on"</span> +type] = <span class="literal">null</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    getEvent: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;<span class="comment">//获取event对象，返回event对象的引用</span></span><br><span class="line">        <span class="keyword">return</span> event ? event : <span class="built_in">window</span>.event;</span><br><span class="line">    &#125;,</span><br><span class="line">    getTarget: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;<span class="comment">//返回事件目标。</span></span><br><span class="line">        <span class="keyword">return</span> event.target || event.srcElement;</span><br><span class="line">    &#125;,</span><br><span class="line">    preventDefault: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>)</span>&#123;<span class="comment">//取消或者阻止事件默认行为</span></span><br><span class="line">        <span class="keyword">if</span>(event.preventDefault) &#123;</span><br><span class="line">            event.preventDefault();</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            event.returnValue = <span class="literal">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    stopPropagation: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;<span class="comment">//阻止事件流，阻止事件冒泡</span></span><br><span class="line">        <span class="keyword">if</span>(event.stopPropagation) &#123;</span><br><span class="line">            event.stopPropagation();</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            event.cancelBubble = <span class="literal">true</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    getRelatedTarget: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>)</span>&#123;<span class="comment">//返回相关元素信息（仅对于mouseover和mouseout事件）</span></span><br><span class="line">        <span class="keyword">if</span> (event.relatedTarget)&#123;</span><br><span class="line">            <span class="keyword">return</span> event.relatedTarget;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (event.toElement)&#123;</span><br><span class="line">            <span class="keyword">return</span> event.toElement;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (event.fromElement)&#123;</span><br><span class="line">            <span class="keyword">return</span> event.fromElement;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    getWheelDelta: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;<span class="comment">//获取鼠标滚轮增量值，检测是否包含WheelDelta</span></span><br><span class="line">        <span class="keyword">if</span>(event.wheelDelta) &#123;</span><br><span class="line">            <span class="keyword">return</span> event.wheelDelta;</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> -event.detail * <span class="number">40</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    getCharCode: <span class="function"><span class="keyword">function</span>(<span class="params">event</span>) </span>&#123;<span class="comment">//获取键盘按键键码。</span></span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">typeof</span> event.charCode == <span class="string">'number'</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> event.charCode;</span><br><span class="line">        &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> event.keyCode;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    getButton:<span class="function"><span class="keyword">function</span>(<span class="params">event</span>)</span>&#123;<span class="comment">//在mouseup或者mousedown的时候，event存在一个button属性，用于判断是按了鼠标左键，右键，还是中键，0鼠标主键按钮，1是中间，2是次键（右键）</span></span><br><span class="line">        <span class="keyword">if</span>(<span class="built_in">document</span>.implementation.hasFeature(<span class="string">"MouseEvents"</span>,<span class="string">"2.0"</span>))&#123;</span><br><span class="line">            <span class="keyword">return</span> event.button;</span><br><span class="line">        &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">            <span class="keyword">switch</span>(event.button)&#123;</span><br><span class="line">                <span class="keyword">case</span> <span class="number">0</span>:</span><br><span class="line">                <span class="keyword">case</span> <span class="number">1</span>:</span><br><span class="line">                <span class="keyword">case</span> <span class="number">3</span>:</span><br><span class="line">                <span class="keyword">case</span> <span class="number">5</span>:</span><br><span class="line">                <span class="keyword">case</span> <span class="number">7</span>:</span><br><span class="line">                  <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">                <span class="keyword">case</span> <span class="number">2</span>:</span><br><span class="line">                <span class="keyword">case</span> <span class="number">6</span>:</span><br><span class="line">                   <span class="keyword">return</span> <span class="number">2</span>;</span><br><span class="line">                <span class="keyword">case</span> <span class="number">4</span>:</span><br><span class="line">                  <span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line"></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
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<h2 id="使用方法"><a href="#使用方法" class="headerlink" title="使用方法"></a>使用方法</h2><p>例如click事件</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> btn1 = <span class="built_in">document</span>.getElementById(<span class="string">"myBtn1"</span>);</span><br><span class="line"><span class="keyword">var</span> handler = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">alert(<span class="string">"hello haorooms"</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">EventUtil.addHandler(btn1, <span class="string">"click"</span>, handler);</span><br><span class="line"><span class="comment">//EventUtil.removeHandler(btn1, "click", handler);</span></span><br></pre></td></tr></table></figure>
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                    <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#前言"><span class="toc-number">1.</span> <span class="toc-text">前言</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#跨浏览器的事件对象EventUtil-事件处理程序"><span class="toc-number">1.1.</span> <span class="toc-text">跨浏览器的事件对象EventUtil(事件处理程序)</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#使用方法"><span class="toc-number">1.2.</span> <span class="toc-text">使用方法</span></a></li></ol></li></ol>
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